SBRT 2016

Protective shielding Collimator channels Frame-based Stereotactic Radiosurgery Positioning Accuracy Accuracy and stability of positioning in radiosurgery: long –term results of the Gamma Knife system. Heck B et al

Leksell ® Coordinate Frame Isocenter/ Target in the brain

Graf Chromic films densitometric measurements X: - 0.014+/- 0.09mm Y: 0.013+/- 0.09mm Z: - 0.002+/- 0.06mm MRI-based target definition

Patient positioning system

Radiation sources

X: 0.06+/-0.09mm Y: 0.04+/-0.09mm

All measured data were within a sphere of 0.2mm radius Target delineation: GTV=PTV

Med Phys 2007 Apr; 34(4): 1487-95